Sigma factors are initiation factors that promote the attachment of RNA polymerase to specific initiation sites and are then released. Extracytoplasmic function (ECF) sigma factors are held in an inactive form by an anti-sigma factor (RsrA) until released. Responds to thiol-oxidative stress, involved in regulation of about 30 genes and operons, including the thioredoxin system (trxB-trxA, trxC), ribosomal protein L31, RNA polymerase-binding protein RbpA and mycothiol (MSH) biosynthetic (mshA) and recycling genes (mca). In conjunction with its cognate anti-sigma factor RsrA may sense the intracellular level of reduced MSH.

Belongs to the sigma-70 factor family. ECF subfamily.

227 amino acids

MGPVTGTDAGTEHGQAEQPEGRGTGAESTAERSARFERDALEFLDQMYSAALRMTRNPADAEDLVQETYAKAYASFHQFREGTNLKAWLYRILTNTFINSYRKKQREPQRSAAEEIEDWQLARAESHMSTGLRSAESQALDHLPDSDVKQALQAIPEEFRIAVYLADVEGFAYKEIADIMGTPIGTVMSRLHRGRRQLRGMLEDYARDRGLVPAGAGESNEAKGSGS

25.2 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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